JP3004164B2 - Wheel for double-sided surface grinding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-sided surface grinding wheel, and more particularly to a method for grinding a workpiece having a particularly large grinding surface by forming holes having different diameters in a grinding surface at a substantially constant area density. The present invention relates to a technique for improving the grinding efficiency when performing the coating and preventing the grinding burn.

[0002]

2. Description of the Related Art Work materials such as outer and inner peripheral wheels of a roller bearing are passed between opposed grinding planes of a pair of surface grinding wheels fixed to a pair of rotating means main shafts. Double-sided surface grinding is known in which both surfaces of the work material are subjected to surface grinding. A grindstone used for such double-sided surface grinding has a large number of small-diameter holes for improving the circumference of the grinding fluid and facilitating the discharge of grinding chips generated from the work material and the grinding wheel. For example, U.S. Pat.
No. 1,799 describes a grinding wheel for surface grinding.

[0003]

By the way, when a work material having a large area to be ground like a disk rotor of a disk brake is used, the grinding efficiency can be obtained even with the above-mentioned surface grinding wheel. However, there was a problem that grinding burn occurred. In other words, when the surface to be ground of the work material is large, the grinding efficiency is reduced because the surface pressure per unit area of the grinding wheel for surface grinding cannot be obtained, while a pair of surface grinding is performed to increase the surface pressure. If the pinching pressure by the grinding wheel is increased, the grinding fluid may be insufficiently supplied, or the small diameter hole may be clogged with cutting chips, resulting in the occurrence of grinding burn.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to improve the grinding efficiency even with a work material having a relatively large area. An object of the present invention is to provide a double-sided surface grinding wheel that is obtained and does not cause grinding burn.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the gist of the present invention is to provide a grinding machine which is fixed to a pair of rotating spindles so that the grinding planes face each other and passes between the grinding planes. In a disc-shaped double-sided surface grinding wheel that performs surface grinding on both surfaces of a material, one large-diameter hole and
Minimum array unit from at least one small hole adjacent to
And arrange the minimum array unit on the grinding plane.
Thus, a large number of small-diameter holes and large-diameter holes larger than the small-diameter holes are arranged on the grinding plane with a substantially constant area density.

[0006]

[ Function ] By doing so, one large diameter hole and its adjacent
The minimum array unit is composed of at least one small hole
And the minimum arrangement unit is arranged on the grinding plane.
Since the small-diameter hole and the large-diameter hole larger than the small-diameter hole are arranged at substantially uniform area densities, the area involved in grinding the grinding surface of the grinding wheel for surface grinding has a large number of uniform diameters. Is smaller than arranging a small diameter hole.

Therefore, the surface pressure per unit area of the grinding surface of the grinding wheel for the surface grinding with respect to the work material is increased, so that the grinding efficiency can be obtained. In addition, the presence of the large-diameter hole facilitates the supply of the grinding fluid and the discharge of the cutting chips, so that the grinding burn is suitably prevented. In addition, the large-diameter hole and the small-diameter hole are next to each other.
Contact, so large chips catch chips and discharge chips
Synergistic effect that clogging of small diameter holes is eliminated by easiness
As a result, the grinding efficiency is further improved.

[0008]

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a sectional view showing an attached state of a double-sided surface grinding grindstone 10. In the drawing, a disk-shaped base metal 14 is integrally fixed to a rotating spindle 12 of a grinding machine (not shown). A large number of bolts 16 are passed through mounting holes 18 of the base metal 14 and are mounted on mounting surfaces 20 of the double-sided surface grinding grindstone 10.
Mounting nuts 22a, 22b, 22c, 2
2d and 22e (only 22c is shown in FIG. 1), whereby the double-sided surface grinding grindstone 10 rotated at high speed is firmly fastened to the base metal 14.

The rotary spindle 12 of the grinding machine is formed with a grinding fluid supply hole 24 passing therethrough, and a grinding fluid from a grinding fluid pumping device (not shown) passes through the grinding fluid supply hole 24 to perform double-sided surface grinding. Is guided to the center of the grinding wheel 10.

The double-sided surface grinding grindstone 10 is, for example, a well-known resinoid grindstone, and has a grinding plane 26 for polishing a work (not shown) and the mounting surface 20.
Is formed in a disk shape having a predetermined thickness provided on both sides.
As shown in detail in FIG. 2, the double-sided surface grinding wheel 10 has a single central through-hole 28a for penetrating in the thickness direction and supplying a grinding fluid to the grinding surface 26. The first through-holes 28b and the eight second through-holes 28c are formed along two concentric circles whose diameters increase in order and at substantially equal intervals in the circumferential direction. In addition, three first mounting nuts 22a and eight second mounting nuts 22b, 12 are provided on the mounting surface 20 of the double-sided surface grinding whetstone 10.
The third mounting nuts 22c, the twelve fourth mounting nuts 22d, and the 16 fifth mounting nuts 22e are buried along five concentric circles having sequentially larger diameters and at substantially equal intervals in the circumferential direction. ing.

Further, on the mounting surface 20, a first annular groove 30 is formed between the first mounting nut 22a and the second mounting nut 22b.
The second annular groove 3 is provided between the second mounting groove 22b and the third mounting nut 22c.
2 are formed. Then, five first protruding grooves 36 protrude from the first annular groove 30 to the outer peripheral side, and eight second protruding grooves 38 protrude from the second annular groove 32 to the outer peripheral side. Then, three radial grooves 39 are formed between the center of the mounting surface 20 and the second annular groove 32, and the grinding fluid is guided to the first annular groove 30 and the second annular groove 32. I have.

The eight first through holes 28b are located at the same radial position as the second mounting nut 22b, and three of them are opened at the bottom of the radial groove 39.
Five are open at the bottom surface of the tip of the first protruding groove 36.
The eight second through holes 28c are located at the same radial position as the third mounting nut 22c.
The second protruding groove 38 is open at the bottom surface at the tip end.

Thus, the grinding fluid supplied from the grinding fluid supply hole 24 vertically passing through the rotary spindle 12 passes through the radial groove 39 and the annular grooves 30 and 32, and further, the annular grooves 30 and 32.
Through the protruding grooves 36 and 38 protruding from the
From the through hole 28b and the second through hole 28c,
Supplied to Here, in the outer peripheral region of the mounting surface 20 of the double-sided surface grinding grindstone 10, although the radial gap of the mounting nut 22 is narrowed and an annular groove is difficult to be formed,
A first protruding groove 36 and a second protruding groove 38 may protrude from the first annular groove 30 and the second annular groove 32 so as to be located between the mounting nuts 22 in the circumferential direction. 32
The first through hole 28 between the second mounting nut 22b and the third mounting nut 22c,
b and a second through hole 28c are formed.

Although omitted from FIG. 1, as shown in FIG. 3, a large number of small-diameter holes 40 and a large-diameter hole 42 having a larger diameter than the small-diameter holes 40 are formed on the grinding surface 26 of the grinding wheel 10 for double-sided surface grinding. Are arranged at a substantially constant area density. The small-diameter hole 40 and the large-diameter large-diameter hole 42 have, for example, a diameter of about 10 mmφ and a diameter of about 28 mmφ and a length equal to or greater than the effective thickness (thickness that can be consumed by grinding) of the double-sided surface grinding wheel 10. It is open in the plane 26. The small diameter hole 40 and the large diameter hole 42 include one large diameter hole 42 and three small diameter holes 4.
The minimum arrangement units 44 made of 0 are regularly arranged, so that they are arranged with a constant area density except for the peripheral portion of the grinding plane 26. Thereby, the small-diameter hole column in which the small-diameter holes 40 are arranged in the vertical direction, and the small-diameter hole large-diameter in which one small-diameter hole 40 and one large-diameter hole 42 are arranged alternately in the vertical direction. The hole columns are alternately arranged in the horizontal direction in FIG. 3, and three small-diameter holes 40 are located between the large-diameter holes 42 in the horizontal direction in FIG.
At least one small diameter hole 40 is interposed between the large diameter holes 42.

The pair of double-sided surface grinding wheels 10 configured as described above are respectively fixed to the pair of rotary spindles 12 so that the grinding surfaces 26 are opposed and concentric, and are driven to rotate in opposite directions. When a work material such as a disk rotor or an outer peripheral wheel of a roller bearing is guided by a guide rail or a carrier plate (not shown) and passed between the pair of double-sided surface grinding wheels 10, the work material is formed in the process. Surface grinding is performed on both sides of the work material.

According to the double-sided surface grinding wheel 10 of this embodiment, the small-diameter holes 40 and the large-diameter holes 42 having a larger diameter than the small-diameter holes 40 are arranged with a substantially uniform area density. The area involved in the grinding of the ten grinding planes 26 is smaller than arranging a large number of small diameter holes 40 having a uniform diameter. For this reason, even with a work material having a relatively large work surface, the surface pressure per unit area of the work surface of the grinding plane 26 is increased, so that the grinding efficiency can be obtained and the large diameter hole 42 can be formed. The presence thereof facilitates the supply of the grinding fluid and the discharge of the chips, so that the grinding burn is suitably prevented.

In the grinding plane 26 of the present embodiment, a minimum arrangement unit 44 composed of one large-diameter hole 42 and three small-diameter holes 40 is regularly arranged, so that a substantially constant area density is obtained. Since the small-diameter hole 40 and the large-diameter hole 42 are formed in the above, the large-diameter hole 42 and the small-diameter hole 40 are adjacent to each other. The synergistic effect that clogging of the small-diameter hole 40 is also eliminated by the ease with which the large-diameter hole 42 captures the chip and discharges the chip has an advantage that the grinding efficiency is further improved.

Further, according to this embodiment, since grinding burn is suppressed, it is possible to use a grindstone having a relatively high degree of bonding, and thus there is an advantage that the durability life is extended.

Further, according to the present embodiment, the large-diameter hole 42 and the small-diameter hole 40 are uniformly mixed to form the ground plane 26.
Since the area involved in the grinding of the surface is reduced, the weight of the surface grinding wheel 10 is reduced.
2 is advantageous in that the load per piece can be reduced, the peripheral speed during grinding can be increased, and the grinding efficiency can be increased.

Further, according to the present embodiment, the first annular groove 30
Since the grinding fluid is supplied to the grinding plane 26 through the first through hole 28b and the second through hole 28c provided on the outer peripheral side of the second annular groove 32, the grinding fluid is supplied to the outer peripheral area of the grinding plane 26. It can be supplied relatively satisfactorily. In addition, even with a work material having a relatively large work surface, grinding burn on the outer peripheral side of the double-sided surface grinding wheel 10 can be suitably prevented, and the grinding efficiency can be increased.

FIGS. 4, 5, and 6 show a cross section, a mounting surface 52, and a grinding plane 54, respectively, showing a mounting state of a double-ended surface grinding grindstone 50 according to another embodiment of the present invention. A disk-shaped base metal 14 is integrally fixed to the rotary spindle 12 of the grinding machine. Many bolts 16
The mounting nuts 56 a, 5 buried in the mounting surface 52 of the double-sided surface grinding grindstone 50 through the mounting holes 18 of the base metal 14.
6b and 56c (only 56b is shown in FIG. 4), whereby the double-sided surface grinding grindstone 50 that is rotated at high speed is firmly fastened to the base metal 14. The double-sided surface grinding grindstone 50 of this embodiment is also a resinoid grindstone, and has a flat and annular shape having a predetermined thickness and a grinding plane 54 and a mounting surface 52 for polishing a work (not shown) on both surfaces. .

As shown in FIG. 6, a large number of small-diameter holes 60 and large-diameter holes 62 larger than the small-diameter holes 60 are arranged on the grinding surface 54 of the double-sided surface grinding wheel 50 with a substantially constant area density. Have been. The small-diameter hole 60 and the large-diameter large-diameter hole 62 have, for example, a diameter of about 10 mmφ and a diameter of about 28 mmφ, and an effective thickness (thickness that can be consumed by grinding) of the double-ended surface grinding wheel 50, for example, a length of about 50 mm. Thus, an opening is formed in the grinding plane 54. The small diameter hole 60 and the large diameter hole 62
Are arranged at a constant area density except for the peripheral part of the grinding plane 54 by regularly arranging the minimum arrangement unit 64 composed of one large-diameter hole 62 and one small-diameter hole 60. . Thereby, in the vertical direction and the horizontal direction of FIG.
The distance between the large-diameter holes 62 is made equal to the diameter thereof, and one small-diameter hole 60 is interposed between the large-diameter holes 62. The large-diameter holes 62 in the oblique direction in FIG. Are set to be about 1/3 of the diameter.

In the double-headed surface grinding wheel 50 of this embodiment, the small-diameter holes 60 and the large-diameter holes 62 having a larger diameter than the small-diameter holes 60 are arranged at substantially uniform area densities. Area involved in the grinding of the grinding surface 54 of
The size is smaller than when a large number of small-diameter holes 60 having a uniform diameter are arranged. Therefore, even with a work material having a relatively large work surface, the surface pressure per unit area of the work surface of the grinding plane 54 is increased, so that the grinding efficiency can be obtained and the large diameter hole 62 can be formed. The presence thereof facilitates the supply of the grinding fluid and the discharge of the chips, so that the grinding burn is suitably prevented.

In the grinding plane 54 of the present embodiment, a minimum arrangement unit 64 composed of one large-diameter hole 62 and one small-diameter hole 60 is regularly arranged, so that a substantially constant area density is obtained. Since the small-diameter hole 60 and the large-diameter hole 62 are formed in the above, the large-diameter hole 62 and the small-diameter hole 60 are adjacent to each other. In addition, there is a synergistic effect that clogging of the small-diameter hole 60 is also eliminated by easiness of catching the chip and discharging of the chip by the large-diameter hole 62, and there is an advantage that the grinding efficiency is further improved.

Also in this embodiment, since grinding burn is suppressed, it is possible to use a grindstone having a relatively high degree of bonding, and thus there is an advantage that the durability life is extended.

Also, in this embodiment, the grinding surface 5 is formed by uniformly mixing the large-diameter holes 62 and the small-diameter holes 60.
Since the area involved in the grinding of No. 4 is reduced, the weight of the grinding wheel 50 for surface grinding is reduced, so that the load per one of the mounting nuts 56a, 56b, 56c is reduced, and the circumference during grinding is reduced. There is an advantage that the speed can be increased and the grinding efficiency can be increased.

In the above-described embodiment, two types of small-diameter holes 40.60 and large-diameter holes 42.62 are formed in the grinding planes 26,5.
Although the holes 4 are arranged at a substantially constant area density, holes having three types of diameters may be arranged.

The small-diameter holes 40.60 and the large-diameter holes 42.62 are provided with mounting nuts 22, 56, annular grooves 30,
32, or may be formed so as to penetrate the double-sided surface grinding grindstones 10 and 50 in the thickness direction as long as they do not interfere with the protruding grooves 36 and 38.

Although not enumerated one by one, the present invention can be variously modified without departing from the gist thereof.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an attached state of a double-sided surface grinding grindstone according to an embodiment of the present invention.

FIG. 2 is a view showing a mounting surface of the double-sided surface grinding grindstone of FIG. 1;

FIG. 3 is a view showing a grinding plane of the double-sided surface grinding wheel of FIG. 1;

FIG. 4 is a view corresponding to FIG. 1 of another embodiment of the present invention.

FIG. 5 is a diagram corresponding to FIG. 2 in the embodiment of FIG. 4;

FIG. 6 is a diagram corresponding to FIG. 3 in the embodiment of FIG. 4;

[Explanation of symbols]

 10: Double-headed surface grinding wheel 12: Rotating spindle 26, 54: Grinding surface 40, 60: Small diameter hole 42, 62: Large diameter hole 44, 64: Minimum array unit

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Ozaki Sachio 2-3-4 Honai, Yao-cho, Negumi-gun, Toyama Pref. Nissin Kogyo Co., Ltd. (56) References JP-A-4-354675 (JP, A JP-A-61-146476 (JP, A) JP-A-57-156210 (JP, A) JP-A-57-108859 (JP, U) JP-A-53-128994 (JP, U) JP-A-60-128 97255 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B24D 7/00 B24B 7/17

Claims (1)

(57) [Claims] 1. A disk-shaped double-sided surface grinding wheel of a type in which grinding surfaces are fixed to a pair of rotating spindles so as to face each other and both surfaces of a work material passing between the grinding surfaces are subjected to surface grinding. One large diameter hole and at least one small diameter hole adjacent to it
To form the minimum array unit from
A double-sided surface grinding wheel characterized in that a large number of small-diameter holes and large-diameter holes larger than the small-diameter holes are arranged on the grinding plane at a substantially constant area density by arranging the row units .